Machine for boring brush-blocks



(No Model.)

C. A. MAHLB' 2 Sheets- Sheet 1.

MACHINE POR BORING BRUSH BLOCKS.

Y Patented Sept. 16,1884.

(No Model.) C. A; MAH'LEI 2 Sheets-Sheet 2.V

MACHINE FOR BORING BRUSH BLDGKS. No. 305,209. Patented Sept. 16, 1.884.

W l IIIIIIIII JF P RS. m-umognphef. wamingwn. DAC,

WITNESSBS tion of the same.

spective of the driving-*board with the boring-A which they are journaled.

Arnett einen.

OLEMENOE A. MAHLE, OF OORRY, PENNSYLVANIA.

MACHINE FOR BORING BRUSH-BLOCKS.

SPECIFICATION forming part of Letters Patent. No. 305,209, dated September 16, 1884.

Application tiled February l2, 1884. (No model.)

To @ZZ whom, it may concern:

Beit known that I, GLEMENQE A. MAHLE, of Corry, in the county of Erie andA State of Pennsylvania, have invented certain new and useful Improvements in Machines for Boring lvlrush-Blocks; and I do hereby declare the following to be a full, clear, and exact description of lthe invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in machines for boring brush-blocks.

The object of my invention is, first, to provide clamps to support and keep from swelling, warping, and splitting the guide-block, through which the boring-tools pass, and in A furtherobject is to provide springs in the driving-board to press upon the ends of such cranks as revolve in a plane that is inclined to the plane in which the driving-board moves to equalize the endpressure on the cranks in all parts of their throw. v

IVth these objects in view, my invention consists in certain features of construction, and in combination of Aparts hereinafter described, and pointed out in the claims.

My invention is designed as an improvement on Patent No. 284,128, and Reissue Patent No. 8,647, of April 1, 1879.

In the accompanying drawings, Figure l is a view in perspective of a machine for boringblocks for brushes that embodies my invention. Fig. 2 is a vertical longitudinal section of the same. Fig. 3 is a view in perspective of the guide-blocks with my improved clamps attached. Fig. 4 is a transverse vertical sec- Fig. 5 is a View in perbits in position. Fig. 6 is a vertical section of a portion of the guides and drivingboard with aportion of the bits in position and showing the springs in the driving-board. Fig. 7 is an elevation of a'boring-bit.

A represents the supporting-frame, upon which is mounted the shaft B, provided with the driving-pulley B.

G isa shaft journaled in shaft B, but to one side of the center, so that itopera'tes as a crank, and has attached the driving-board l). rlhis driving-boardembraces the wrists of the `cranks of the boringbits, so that the motion of the driving-board revolves t-he bits or boring tools E, the shape of which is shown in Fig.'7. The respective Shanks of these bits lare journaled in the guide-blocks F, that are preferably of bass wood. This kind of wood, with all of its good qualities that render it valuable for this purpose, lis liable to warp,

shrink, swell, and consequently to crack. 6o

Any of these changes in the blocks interfere with the working of the bits, and is especially liable to cramp them atv the crank ends in the engagement with the driving-block. I

have therefore invented the clamps F, by

means ot' which the guide-blocks are held firmlyin the proper position. The clamps are each of a single metal plate provided with ribs f, that embrace the sides of the blocks, and are secured by the bolts j", that pass between the' blocks near the end thereof. The bits, in Y the main, are parallel with each other, or nearly so but it is desirable to have those on the outside of the group converge toward this point. ject some distance beyond the guide-boards, and the brush-blocks are thin and the wood yielding, so thatI no difficulty is encountered' with this'part when the bits converge, as

The bits are small, elastic, and proshown in Fig. 6. The en d-thrust of the bits are 8o held by the wrists of the cranks bottoining in the holes in which they are respectively jour- -naled in the driving-block D. The cranks of these converging bits aforesaid would not revolve in. a plane parallel with the plane in which the driving-board. moves, and consequently, if thrust back so that the wrist would bottom in its hole during each revolution, the bits (the motions of which are very rapid) tion that would wear the parts rapidly. I have therefore introduced the coiled springs d into such of the holes in the driving-board D as engage the cranks of the inclined or converged would be subject to a reciprocating end mo- 9o bits. These springs, pressing against .the end g5 IOO on suitable ways or guides on the part A. A rod, g, connects this part to the bellecranl; H, the horizontal arm of which is connected by the link i to the footdever I. Vhen one end of the foot-lever is pressed down, the clamp G is advanced toward the bits. 'Vhen the pressure is removed, the lever, by means of the spring J, is drawn np, by means of which the clamp is drawn back from the bits.

That I claim isn 1. The Combination, with a series of boring`- tools Yoperated simultaneously by suitable mechanism, and guidingbloeks for hold-ing the boringftools in position, ofthe metallic clamps l1", having,` side lips or flanges, j', and bolts for binding` the clamps and guidi-ngbloeks together.

2. Thecombination, with a series of boring tools constructed as shown, and the drivingboard D, of the guiding-blocks F, the clamps F, and bolts j", all of the above parts combined as described.

3. In a machine for boring brush-blocks, the combination, with the boring-tools constructed as described, the driving-board and guiding-blocks, of the springs (Z, seated in the driving-board, and operating` as described.

In testimony whereof I sign this specifica1 tion, in the presence of two Witnesses, this 7th day of January, 1884.

' @LEB/[ENCE A. MAHLE.

Vitnesses:

ALBERT E. LYNCH, Crus. H. Denen. 

